file.c: insert separator

* file.c (rb_sys_fail_path0): insert separator between function name
  and path name.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39755 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Makefile.sub: __FUNCTION__

* win32/Makefile.sub (config.h): __FUNCTION__ is available at least
  VC9.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39756 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-03-15

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39757 b2dd03c8-39d4-4d8f-98ff-823fe69b080e